moving our economy for 160 years. bnsf, the engine that connects us. >> and by the bill and melinda gates foundation. dedicated to the idea that all people deserve the chance to live a healthy, productive life. >> and with the ongoing support of these institutions and foundations. and... >> this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> woodruff: a decade after the iraq war began, the violence has not abated. today was the bloodiest day this year, as insurgents staged multiple attacks. a high-level minister was assassinated and dozens more died. a warning: our story contains some graphic images. thick, black smoke rose above the sadr city district in baghdad, where a car bomb went off today, in one of several coordinated attacks to rock the iraqi capital. 65 people were killed and more than 100 wounded. in another instance, an explosion ripped through a popular market near baghdad's fortified green zone. >> there